The "official documentary historical record of major U.S. foreign policy decisions that have been declassified and edited for publication. The series is produced by the State Department's Office of the Historian and printed volumes are available from the Government Printing Office."

"FRUS begins with the administration of Abraham Lincoln in 1861. There are two cumulative indexes covering 1861-1899 and 1900-1918. The organization of FRUS is generally chronological, but the dates of the volumes do not necessarily reflect the dates of documentary history. For example, the volumes for 1900-1918 do not include the records dealing with World War I or the Russian Revolution. Each volume has a subject and author index. There is also typically a table of sources and abbreviations at the beginning of each volume."

A "project of the University of Wisconsin-Madison Libraries in collaboration with the University of Illinois at Chicago Libraries. This is an incomplete run from 1861-1960 with missing volumes being added as they can be acquired and processed."